CN221080255U - Battery pack and explosion-proof pressure relief valve thereof - Google Patents

Abstract

The utility model discloses an explosion-proof pressure relief valve, which comprises a valve body, a first sealing element, a pressure relief assembly, an elastic element and a breathable film, wherein the valve body is provided with a first sealing element; the interior of the valve body is hollow; the first sealing piece is arranged in the valve body and tightly presses and seals the inner wall surface of the valve body; the pressure relief assembly is axially movably arranged in the valve body and compresses and seals the outer end face of the first sealing element; one end of the elastic piece is connected with the valve body, and the other end of the elastic piece is connected with the pressure relief assembly and is used for enabling the pressure relief assembly to keep pressing the first sealing piece through elastic pretightening force; and the pressure relief assembly is provided with an air vent, and the air permeable membrane is covered on the air vent and is used for enabling gas inside and outside the valve body to permeate. The utility model can reduce the internal and external pressure difference of the battery pack, ensure that the internal and external pressure of the battery pack tends to be balanced, realize rapid pressure relief when the battery pack is out of control, and eliminate potential safety hazard. The utility model also discloses a battery pack, which has the beneficial effects as described above.

Description

Battery pack and explosion-proof pressure relief valve thereof

Technical Field

The utility model relates to the technical field of batteries, in particular to an explosion-proof pressure relief valve. The utility model also relates to a battery pack.

Background

In new energy automobiles or energy storage devices, battery packs are widely used as power sources.

The battery pack is internally integrated with a plurality of batteries, and the battery pack is required to be dustproof and waterproof, so that the inside of the battery pack is required to be designed into an externally-sealed structure, and the pressure which can be born by the shell of the battery pack is not large due to the light-weight design.

At present, when a new energy automobile or energy storage equipment works, a battery can generate heat in the operation process, and heat is accumulated in a battery pack when a plurality of batteries work simultaneously, so that the temperature inside the battery pack is raised, the internal pressure of the battery pack is increased, and then the internal pressure and the external pressure of the battery pack are unbalanced, and the internal pressure and the external pressure difference can cause adverse effects on the stable operation of the equipment. If the battery chip unit is in thermal runaway, the pressure in the battery pack suddenly and rapidly rises, so that the battery pack is damaged, and further safety of equipment and personnel is threatened.

In the prior art, a pressure release valve is usually installed on a battery pack, so that the pressure balance between the inside and the outside of the battery pack is ensured through the pressure release valve, the potential risk is reduced, and in case of thermal runaway of a new energy automobile or energy storage equipment, the pressure is released rapidly, so that the damage caused by the battery pack is reduced. However, the pressure release valve in the prior art has the common air permeability worse although the sealing performance can reach the standard, and when the pressure difference between the inside and the outside of the battery pack is smaller, the pressure of the inside and the outside of the battery pack is difficult to balance; under the condition that the battery chip unit is out of control, a large amount of gas released by the battery is difficult to be rapidly discharged out of the battery pack in a short time, pressure cannot be rapidly released, explosion can be possibly caused, and potential safety hazards are caused.

Therefore, how to reduce the internal and external pressure difference of the battery pack, ensure that the internal and external pressures of the battery pack tend to be balanced, realize rapid pressure relief when the battery pack is out of control, eliminate potential safety hazards, and solve the technical problems faced by the skilled person.

Disclosure of utility model

The utility model aims to provide an explosion-proof pressure release valve, which can reduce the internal and external pressure difference of a battery pack, ensure that the internal and external pressure of the battery pack tends to be balanced, realize quick pressure release when the battery pack is out of control, and eliminate potential safety hazards. Another object of the present utility model is to provide a battery pack.

In order to solve the technical problems, the utility model provides an explosion-proof pressure relief valve, which comprises a valve body, a first sealing element, a pressure relief assembly, an elastic element and a breathable film;

the interior of the valve body is hollow;

The first sealing piece is arranged in the valve body and tightly presses and seals the inner wall surface of the valve body;

The pressure relief assembly is axially movably arranged in the valve body and compresses and seals the outer end face of the first sealing element;

One end of the elastic piece is connected with the valve body, and the other end of the elastic piece is connected with the pressure relief assembly and is used for enabling the pressure relief assembly to keep pressing the first sealing piece through elastic pretightening force;

And the pressure relief assembly is provided with an air vent, and the air permeable membrane is covered on the air vent and is used for enabling gas inside and outside the valve body to permeate.

Preferably, the valve body comprises a valve cylinder for communicating with the shell of the battery pack, a valve cap arranged on the outer edge of the valve cylinder, the first sealing element is arranged in the valve cap, and the pressure relief assembly is axially movably arranged in the valve cylinder.

Preferably, a ring groove is formed between the outer wall of the valve cylinder and the inner wall of the valve bonnet, and the first sealing element is installed in the ring groove and is integrally formed with the ring groove.

Preferably, the outer end surface of the first sealing member is convexly provided with a plurality of convex rings which are coaxially distributed, each convex ring has elasticity, and the pressure relief assembly is used for pressing each convex ring.

Preferably, the pressure relief assembly comprises a pressure relief bracket and a pressure relief cover plate, wherein the pressure relief bracket is axially movably arranged in the valve cylinder, and the pressure relief cover plate is arranged at the top end of the pressure relief bracket so as to compress the outer end surface of the first sealing element; the air holes are formed in the pressure relief cover plate, and the pressure relief support is hollow and communicated with the air holes.

Preferably, a bottom ring edge is arranged at the outer edge of the bottom end of the pressure relief bracket, and a plurality of vent holes are formed in the bottom ring edge and the side wall of the pressure relief bracket;

The inner wall of the valve cylinder is convexly provided with a plurality of limiting blocks, the elastic piece is sleeved outside the pressure relief bracket, the top ends of the elastic pieces are connected to the bottom surfaces of the limiting blocks, and the bottom ends of the elastic pieces are connected to the top surfaces of the bottom annular edges.

Preferably, the side wall of the pressure release bracket is further provided with a plurality of guide sliding grooves extending along the axial direction, the inner wall of each limiting block is provided with a guide sliding block, and each guide sliding groove is respectively used for forming sliding connection with each corresponding guide sliding block.

Preferably, the side wall of the pressure relief bracket is further provided with a plurality of inner connecting holes, the bottom surface of the pressure relief cover plate is convexly provided with a top annular wall, the top annular wall is provided with a plurality of outer connecting holes, and each inner connecting hole is respectively used for being connected with each corresponding outer connecting hole through a fastener.

Preferably, a plurality of positioning protrusions are further arranged on the outer wall of the pressure relief bracket in a protruding mode, a plurality of positioning grooves are formed in the inner wall of the top annular wall, and each positioning protrusion is respectively used for being matched with each corresponding positioning groove.

The utility model also provides a battery pack, which comprises a shell and a pressure relief valve arranged on the shell, wherein the pressure relief valve is specifically an explosion-proof pressure relief valve as set forth in any one of the above.

The utility model provides an explosion-proof pressure relief valve which mainly comprises a valve body, a first sealing element, a pressure relief assembly, an elastic element and a breathable film. The valve body is a main body part of the explosion-proof pressure relief valve and is mainly used for installing and accommodating other parts, and the inside of the valve body is provided with a cavity and is of a hollow structure so as to enable air to circulate. The first sealing element is arranged in the valve body, is usually arranged at one end position of the valve body, and is mainly used for pressing the inner wall surface of the valve body to form a seal so as to prevent foreign matters such as external liquid or dust from entering the valve body or the battery pack through the installation interface of the first sealing element and the valve body. The pressure release assembly is arranged in the valve body and is in sliding connection with the valve body, has axial movement freedom degree, can axially move in the valve body, and is mainly used for compressing the outer end face of the first sealing element under a natural state (without axially moving) to form a seal, so that foreign matters such as external liquid or dust are prevented from entering the valve body or a battery pack through gaps between the pressure release assembly and the first sealing element. Of course, if the pressure release subassembly is in the valve body when moving along the axial direction who keeps away from first sealing member, then the pressure release subassembly breaks away from the outer terminal surface of first sealing member, no longer forms sealedly between the two, and the valve body is inside open this moment, can make gaseous through the annular gap discharge between pressure release subassembly and the first sealing member when the thermal runaway appears in the battery package, realizes quick pressure release. One end of the elastic piece is connected with the valve body, the other end of the elastic piece is connected with the pressure relief assembly, and the elastic piece is mainly used for forming elastic pretightening force on the pressure relief assembly so that the pressure relief assembly can keep pressing the first sealing piece through the elastic pretightening force, and therefore the pressure relief assembly can keep a sealing state with the first sealing piece in a natural state. Meanwhile, the pressure release assembly is provided with the air holes, the air permeable membrane is covered on the air holes and is mainly used for enabling air to permeate and preventing solid impurities such as liquid or dust from passing through, so that air inside and outside the valve body is allowed to permeate on the basis of ensuring certain waterproof and dustproof sealing performance, and further, when the pressure difference inside and outside the battery pack is smaller, the balance of the internal pressure and the external pressure of the battery pack is ensured. Therefore, according to the explosion-proof pressure relief valve provided by the utility model, through the compression action of the first sealing element on the inner wall surface of the valve body and the compression action of the pressure relief assembly on the outer end surface of the first sealing element, the external sealing of the valve body is realized, meanwhile, the elastic pretightening force of the elastic element is utilized to ensure the sealing performance, and when the internal and external pressure difference of the battery pack is smaller, the gas inside and outside the valve body can enter and exit through the ventilation holes on the pressure relief assembly, so that the internal and external pressure balance of the valve body is realized; when thermal runaway appears in the battery package, the battery package produces a large amount of gases, only is difficult to discharge fast through the bleeder vent, and the internal atmospheric pressure of battery package increases fast this moment to overcome the elasticity of elastic component, promote the outward removal of pressure release subassembly, make the pressure release subassembly break away from the outer terminal surface of first sealing member, the sealed temporary failure between the two, the valve body gets into open state, and then makes gaseous can discharge to the external world through the annular gap between pressure release subassembly and the first sealing member, realizes quick pressure release. In summary, the explosion-proof pressure release valve provided by the utility model can reduce the internal and external pressure difference of the battery pack, ensure that the internal and external pressure of the battery pack tends to be balanced, realize quick pressure release when the battery pack is out of control, and eliminate potential safety hazards.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic overall structure of an embodiment of the present utility model.

Fig. 2 is an exploded view of the structure of fig. 1.

Fig. 3 is a longitudinal sectional view of fig. 1.

Fig. 4 is a detailed structural cross-sectional view of the valve body.

Fig. 5 is a top view of the valve body.

Fig. 6 is a schematic diagram showing an integrated structure of the valve body and the first seal member.

Fig. 7 is a schematic diagram of a specific structure of the pressure release bracket.

Fig. 8 is a schematic diagram of a specific structure of the pressure release cover plate.

Wherein, in fig. 1-8:

A valve body-1, a first sealing element-2, a pressure relief assembly-3, an elastic element-4, a breathable film-5, a fastener-6 and a second sealing element-7;

valve cylinder-11, valve cap-12, ring groove-13;

Convex ring-21;

the pressure relief bracket-31, the pressure relief cover plate-32 and the ventilation holes-33;

A limiting block-111, a guide slide block-112;

Bottom ring edge-311, vent hole-312, guide chute-313, inner connecting hole-314, positioning protrusion-315;

Top annular wall-321, outer connecting hole-322, positioning groove-323.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, 2 and 3, fig. 1 is a schematic overall structure diagram of an embodiment of the present utility model, fig. 2 is an exploded view of the structure of fig. 1, and fig. 3 is a longitudinal sectional view of fig. 1.

In one specific embodiment provided by the utility model, the explosion-proof pressure relief valve mainly comprises a valve body 1, a first sealing element 2, a pressure relief assembly 3, an elastic element 4 and a ventilation membrane 5.

The valve body 1 is a main body part of an explosion-proof pressure relief valve and is mainly used for installing and accommodating other parts, and the inside of the valve body 1 is provided with a cavity and is of a hollow structure so as to enable air to circulate.

The first sealing member 2 is installed in the valve body 1, and is generally installed at one end position of the valve body 1, and is mainly used for pressing the inner wall surface of the valve body 1 to form a seal, so that foreign matters such as external liquid or dust are prevented from entering the valve body 1 or the battery pack through the installation interface of the first sealing member 2 and the valve body 1.

The pressure release assembly 3 is installed in the valve body 1 and forms sliding connection with the valve body 1, has axial movement freedom degree, can axially move in the valve body 1, is mainly used for compressing the outer end face of the first sealing member 2 under a natural state (without axially moving) to form a seal, and prevents foreign matters such as external liquid or dust from entering the valve body 1 or a battery pack through a gap between the pressure release assembly 3 and the first sealing member 2. Of course, if the pressure release assembly 3 moves in the valve body 1 along the axial direction far away from the first sealing member 2, the pressure release assembly 3 is separated from the outer end surface of the first sealing member 2, no seal is formed between the pressure release assembly 3 and the first sealing member, at this time, the interior of the valve body 1 is opened, and when the thermal runaway occurs in the battery pack, gas can be discharged through the annular gap between the pressure release assembly 3 and the first sealing member 2, so that rapid pressure release is realized.

One end of the elastic piece 4 is connected with the valve body 1, the other end of the elastic piece is connected with the pressure relief assembly 3, and the elastic piece is mainly used for forming elastic pretightening force on the pressure relief assembly 3 so that the pressure relief assembly 3 can keep pressing the first sealing piece 2 through the elastic pretightening force, and therefore the pressure relief assembly 3 can keep a sealing state with the first sealing piece 2 in a natural state.

Meanwhile, the pressure release assembly 3 is provided with the air holes 33, the air permeable membrane 5 is covered on the air holes 33, the air permeable membrane 5 is mainly used for enabling air to permeate and preventing solid impurities such as liquid or dust from passing through, so that the air inside and outside the valve body 1 is allowed to permeate on the basis of ensuring certain waterproof and dustproof sealing performance, and further, when the pressure difference inside and outside the battery pack is smaller, the pressure balance inside and outside the battery pack is ensured.

In this way, according to the explosion-proof pressure release valve provided by the embodiment, through the compression action of the first sealing element 2 on the inner wall surface of the valve body 1 and the compression action of the pressure release component 3 on the outer end surface of the first sealing element 2, the external sealing of the valve body 1 is realized, meanwhile, the sealing performance is ensured by utilizing the elastic pretightening force of the elastic element 4, and when the internal and external pressure difference of the battery pack is smaller, the gas inside and outside the valve body 1 can enter and exit through the ventilation hole 33 on the pressure release component 3, so that the internal and external pressure balance of the valve body 1 is realized; when the thermal runaway appears in the battery package, the battery package produces a large amount of gases, only is difficult to discharge fast through bleeder vent 33, and the internal atmospheric pressure of battery package increases fast this moment to overcome the elasticity of elastic component 4, promote the outwards removal of pressure release subassembly 3, make pressure release subassembly 3 break away from the outer terminal surface of first sealing member 2, the sealed temporary failure between the two, valve body 1 gets into open state, and then makes gaseous can discharge to the external world through the annular gap between pressure release subassembly 3 and the first sealing member 2, realizes quick pressure release.

In addition, when most of the gas in the battery pack is discharged, the pressure in the battery pack is rapidly reduced until the pressure is smaller than the elastic force of the elastic member 4, the elastic force of the elastic member 4 drives the pressure relief assembly 3 to axially move again, and the outer end surface of the first sealing member 2 is compressed again, so that the sealing of the valve body 1 is realized again.

In summary, the explosion-proof pressure release valve provided in this embodiment can reduce the internal and external pressure difference of the battery pack, ensure that the internal and external pressure of the battery pack tends to be balanced, and simultaneously realize quick pressure release when thermal runaway occurs in the battery pack, thereby eliminating potential safety hazards.

As shown in fig. 4, fig. 4 is a specific structural sectional view of the valve body 1.

In one particular embodiment with respect to the valve body 1, the valve body 1 basically includes a valve cartridge 11 and a bonnet 12. The valve cylinder 11 is cylindrical or square, hollow in the interior and provided with an axial cavity, and is mainly used for being connected with the shell of the battery pack, so that the valve cylinder 11 is communicated with the interior of the battery pack. Generally, in order to facilitate the detachable connection between the valve cylinder 11 and the housing of the battery pack, in this embodiment, threads are provided on the outer periphery of the valve cylinder 11 to form a threaded connection with the housing of the battery pack. The valve cap 12 is disposed on the outer edge of the valve cylinder 11, and is generally located on the outer edge of the outer end of the valve cylinder 11, and is specifically annular, such as a circular ring or a rectangular ring, etc., and the top is not closed, so that the gas can be normally discharged through the valve cap 12 during rapid pressure relief. Accordingly, the first seal 2 is specifically mounted within the bonnet 12 and the pressure relief assembly 3 is mounted within the valve cartridge 11 and is axially movable within the valve cartridge 11.

As shown in fig. 6, fig. 6 is a schematic view showing an integral structure of the valve body 1 and the first seal member 2.

Considering that in the prior art, the valve body 1 and the sealing member of the pressure release valve are independent parts, and the later assembly is required through the installation procedure, and the sealing protection effect is poor due to the influence of the installation error. In this embodiment, a ring groove 13 is formed between the outer wall of the valve cylinder 11 and the inner wall of the valve cap 12, and the first sealing member 2 is installed in the ring groove 13, and the first sealing member 2 and the ring groove 13 are integrally formed, for example, the first sealing member 2 is vulcanized and fixed in the ring groove 13 by using an adhesive such as rubber, or integrally formed by an additive manufacturing process, a subtractive manufacturing process, or the like. In this way, the sealing effect of the first seal 2 against the inner wall surface of the bonnet 12 can be improved.

Similarly, in order to improve the compression sealing effect of the pressure relief assembly 3 on the outer end face of the first sealing member 2 and optimize the waterproof and dustproof performance level of the battery pack, in this embodiment, a plurality of (one or more) convex rings 21 are convexly arranged on the outer end face of the first sealing member 2, and each convex ring 21 has elasticity, and accordingly, the pressure relief assembly 3 is mainly used for compressing each convex ring 21. By means of the arrangement, the outer end face of the first sealing element 2 can be pressed more tightly by the pressure release assembly 3 by utilizing the elastic deformation characteristic of each convex ring 21, and the contact area of the two is larger, so that a better sealing effect is achieved. Generally, the method is used for the treatment of a disease. When the outer end surface of the first sealing member 2 is convexly provided with a plurality of convex rings 21, the convex rings 21 are coaxially distributed for ensuring sealing balance.

In one particular embodiment with respect to the pressure relief assembly 3, the pressure relief assembly 3 basically includes a pressure relief bracket 31 and a pressure relief cover plate 32. The pressure release bracket 31 is specifically installed in the valve cylinder 11, and can move axially in the valve cylinder 11. The pressure release cover plate 32 is arranged at the top end of the pressure release bracket 31, is connected with the pressure release bracket 31 into a whole, can move along with the pressure release bracket 31 in the synchronous axial direction, and is mainly used for compressing the outer end face or the convex ring 21 of the first sealing element 2. Meanwhile, the pressure release bracket 31 is specifically hollow cylindrical or square cylindrical, and the axial length of the pressure release bracket is equivalent to that of the valve cylinder 11, and the radial dimension of the pressure release bracket is smaller than the inner diameter of the valve cylinder 11. The pressure release cover plate 32 is specifically in a sheet shape, covers the top end face of the pressure release bracket 31, and the outer edge covers the outer end face of the first seal member 2. Correspondingly, the air holes 33 are specifically formed in the pressure relief cover plate 32, the air holes 33 conduct the inside of the pressure relief cover plate 32 with the outside, and the inside of the air holes 33 is conducted with the internal cavity of the pressure relief bracket 31, so that the gas in the battery pack can be discharged to the outside through the pressure relief bracket 31 and the air holes 33.

As shown in fig. 7, fig. 7 is a schematic diagram of a specific structure of the pressure release bracket 31.

In one embodiment of the pressure relief bracket 31, a bottom rim 311 is provided at the bottom edge of the pressure relief bracket 31. Specifically, the outer diameter of the bottom rim 311 is equal to or slightly smaller than the inner diameter of the valve cylinder 11, and a plurality of ventilation holes 312 are formed in the bottom rim 311. At the same time, a plurality of vent holes 312 are also provided in the side wall of the pressure release bracket 31. So set up, because first sealing member 2 installs in valve cap 12, and pressure release support 31 installs in valve section of thick bamboo 11, therefore first sealing member 2 is located the outside of pressure release support 31, and then the annular gap between messenger's first sealing member 2 and the pressure release apron 32 also is located the outside of pressure release support 31, when the quick pressure release, the gas in the battery package of needs can reach above-mentioned annular gap fast, and in this embodiment, through the air vent 312 on the bottom ring limit 311 and the air vent 312 on the pressure release support 31, open the inside and outside reason of valve section of thick bamboo 11 for the battery package when thermal runaway appears a large amount of gas that produces, not only can directly get into the annular gap between first sealing member 2 and the pressure release apron 32 from the outer fringe of valve section of thick bamboo 11 through the air vent 312 on the bottom ring limit 311, still can get into the annular gap between first sealing member 2 and the pressure release apron 32 from the inner edge of valve section of thick bamboo 11 after through the air vent 312 on the inside cavity and the lateral wall of pressure release support 31, thereby improve gas discharge, the speed of accelerating. Compared with the pressure release valve in the prior art, the pressure release valve has the advantages that the structure or the part occupies the airflow channel in the airflow direction, so that the reliability of the pressure release valve is low, the pressure release capacity is weakened, the explosion-proof pressure release valve in the embodiment has no obstruction on the air path, the pressure release speed is high, and the pressure release capacity is stronger.

As shown in fig. 5, fig. 5 is a plan view of the valve body 1.

Meanwhile, considering that when thermal runaway occurs in the battery pack, the rapidly increased air pressure will overcome the elastic force of the elastic member 4 to push the pressure release bracket 31 outwards, in order to prevent the pressure release bracket 31 from being directly separated from the valve body 1, a limiting block 111 is added in the embodiment. Specifically, the stoppers 111 are disposed on the inner wall of the valve cylinder 11 in a protruding manner, and a plurality of stoppers 111, for example, 3 to 6 stoppers or the like, may be disposed at the same time, and each stopper 111 may be uniformly distributed along the circumferential direction of the valve cylinder 11. So set up, when the air pressure in the battery package promotes the outward motion of pressure release support 31, the bottom ring limit 311 on the outer fringe of pressure release support 31 bottom will form the butt with each stopper 111 to the maximum release distance of restriction pressure release support 31 prevents that pressure release support 31 from coming off from valve body 1.

Correspondingly, in a specific embodiment of the elastic member 4, the elastic member 4 is specifically a cylindrical spring, etc., and is sleeved outside the pressure release bracket 31, and the top end of the elastic member 4 is connected to the bottom surface of each limiting block 111, and the bottom end of the elastic member 4 is connected to the top surface of the bottom rim 311. So configured, in a natural state, the elastic member 4 has a precompression amount, thereby forming an axially inward (or downward) elastic preload against the bottom rim 311, which causes the pressure relief cover plate 32 to compress against the outer end surface or collar 21 of the first seal member 2.

In another embodiment of the elastic member 4, the elastic member 4 is not disposed in the valve cylinder 11, but is mounted by a frame body mounted on the outer end (or above) of the valve cap 12, where the inner end of the elastic member 4 is connected to the outer side surface of the pressure release cover plate 32, and has a pre-compression amount in a natural state, so as to form an elastic pre-compression force on the pressure release cover plate 32 inwards along the axial direction, and the elastic pre-compression force also causes the pressure release cover plate 32 to compress the outer end surface or the convex ring 21 of the first sealing member 2.

In order to ensure that the pressure release bracket 31 can stably perform axial movement under the air pressure pushing action in the battery pack, a guide chute 313 and a guide sliding block 112 are added in the embodiment. The guide sliding grooves 313 are formed on the side wall of the pressure release bracket 31, and a plurality of guide sliding grooves 313 extend along the axial direction, for example, 3-6 guide sliding grooves are formed at the same time. The guide sliding blocks 112 are arranged on the inner wall of each limiting block 111, the number of the guide sliding blocks is the same as that of the guide sliding grooves 313, so that one-to-one correspondence is formed, each guide sliding block 112 is respectively used for forming sliding connection with the corresponding guide sliding groove 313, so that when the pressure release bracket 31 is pushed by air pressure, the guide sliding blocks can form a guide effect on the movement of the pressure release bracket 31 under the cooperation limitation of the guide sliding grooves 313 and the guide sliding blocks 112, the pressure release bracket 31 can be ensured to stably move axially outwards, and the pressure release bracket 31 is prevented from moving and deflecting or vibrating to impact the inner wall of the valve cylinder 11.

As shown in fig. 8, fig. 8 is a schematic diagram of a specific structure of the pressure release cover 32.

In order to facilitate stable connection and installation between the pressure release bracket 31 and the pressure release cover plate 32, in this embodiment, a plurality of inner connection holes 314 are formed on the side wall of the pressure release bracket 31, and a top annular wall 321 is protruding on the bottom surface of the pressure release cover plate 32. The top annular wall 321 extends axially inward, has an inner diameter corresponding to the outer diameter of the pressure release bracket 31, and has a plurality of outer connecting holes 322 formed in a side wall of the top annular wall 321. The number of the outer connecting holes 322 is the same as that of the inner connecting holes 314 on the pressure release bracket 31, for example, 3 to 6, and the distribution forms are corresponding to each other, and the outer connecting holes 322 and the inner connecting holes can be aligned and communicated with each other and connected through fasteners 6 such as bolts and bolts. So set up, when equipment pressure release support 31 and pressure release apron 32, only need with top rampart 321 back-off at the top of pressure release support 31, the angular position of rotatory regulation pressure release apron 32 again for each external connection hole 322 on top rampart 321 aligns with each internal connection hole 314 on the pressure release support 31 respectively, later the rethread fastener 6 inserts external connection hole 322 and internal connection hole 314 and tautly fixes both.

In addition, in order to ensure that the relative positional relationship between the pressure relief bracket 31 and the pressure relief cover plate 32 is accurate, in this embodiment, a plurality of positioning protrusions 315 are convexly disposed on the outer wall of the pressure relief bracket 31, and meanwhile, a plurality of positioning grooves 323 are disposed on the inner wall of the top annular wall 321 of the pressure relief cover plate 32, where the number of the positioning grooves 323 is the same as that of the positioning protrusions 315, for example, 3 to 6, and the distribution forms correspond to each other, and each positioning groove 323 can respectively form a concave-convex positioning fit with the corresponding positioning protrusion 315. So set up, when equipment pressure release support 31 and pressure release apron 32, only need with each location arch 315 on the pressure release support 31 card respectively go into each positioning groove 323 on the top ring wall 321, can ensure that the relative positional relationship of pressure release support 31 and pressure release apron 32 fixes a position accurately.

In addition, in order to enhance the sealing performance of the valve body 1, the second sealing member 7, such as a sealing ring, etc., is embedded on the inner end surface of the valve cap 12, and is mainly used for pressing the surface of the housing and sealing the mounting structure, such as a threaded hole, etc., on the surface of the housing when the valve barrel 11 is connected with the housing of the battery pack.

The embodiment also provides a battery pack, which mainly comprises a shell and a pressure release valve arranged on the shell, wherein the pressure release valve adopts the technical scheme of the explosion-proof pressure release valve, so the battery pack provided by the embodiment also has the technical effects brought by the technical scheme of the embodiment, and the description is omitted herein.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An explosion-proof pressure release valve is characterized by comprising a valve body (1), a first sealing element (2), a pressure release assembly (3), an elastic element (4) and a ventilation membrane (5);

the interior of the valve body (1) is hollow;

the first sealing element (2) is arranged in the valve body (1) and tightly presses and seals the inner wall surface of the valve body (1);

The pressure relief assembly (3) is axially movably arranged in the valve body (1) and compresses and seals the outer end surface of the first sealing element (2);

One end of the elastic piece (4) is connected with the valve body (1), and the other end of the elastic piece is connected with the pressure relief assembly (3) and is used for enabling the pressure relief assembly (3) to keep pressing the first sealing piece (2) through elastic pretightening force;

And the pressure relief assembly (3) is provided with an air vent (33), and the air permeable membrane (5) is covered on the air vent (33) and is used for enabling gas inside and outside the valve body (1) to permeate.

2. The explosion-proof pressure relief valve according to claim 1, wherein the valve body (1) comprises a valve cylinder (11) for communicating with a housing of a battery pack, a valve cap (12) provided at an outer edge of the valve cylinder (11), the first seal (2) is mounted in the valve cap (12), and the pressure relief assembly (3) is axially movably mounted in the valve cylinder (11).

3. The explosion-proof pressure relief valve according to claim 2, wherein a ring groove (13) is formed between the outer wall of the valve cylinder (11) and the inner wall of the valve cap (12), and the first sealing member (2) is installed in the ring groove (13) and is integrally formed with the ring groove (13).

4. The explosion-proof pressure relief valve according to claim 1, wherein the outer end surface of the first sealing member (2) is convexly provided with a plurality of convex rings (21) which are coaxially distributed, each convex ring (21) has elasticity, and the pressure relief assembly (3) is used for compressing each convex ring (21).

5. The explosion-proof pressure relief valve according to claim 2, wherein the pressure relief assembly (3) comprises a pressure relief bracket (31) and a pressure relief cover plate (32), the pressure relief bracket (31) is axially movably installed in the valve cylinder (11), and the pressure relief cover plate (32) is arranged at the top end of the pressure relief bracket (31) so as to press the outer end face of the first sealing element (2); the air holes (33) are formed in the pressure relief cover plate (32), and the pressure relief bracket (31) is hollow and communicated with the air holes (33).

6. The explosion-proof pressure relief valve according to claim 5, wherein a bottom annular edge (311) is arranged at the bottom end outer edge of the pressure relief bracket (31), and a plurality of vent holes (312) are formed in the bottom annular edge (311) and the side wall of the pressure relief bracket (31);

The valve is characterized in that a plurality of limiting blocks (111) are convexly arranged on the inner wall of the valve cylinder (11), the elastic piece (4) is sleeved outside the pressure relief bracket (31), the top end of the elastic piece (4) is connected to the bottom surface of each limiting block (111), and the bottom end of the elastic piece (4) is connected to the top surface of the bottom ring edge (311).

7. The explosion-proof pressure relief valve according to claim 6, wherein a plurality of guide sliding grooves (313) extending along the axial direction are further formed in the side wall of the pressure relief bracket (31), guide sliding blocks (112) are arranged on the inner wall of each limiting block (111), and each guide sliding groove (313) is respectively used for forming sliding connection with each corresponding guide sliding block (112).

8. The explosion-proof pressure release valve according to claim 5, wherein a plurality of inner connecting holes (314) are further formed in the side wall of the pressure release bracket (31), a top annular wall (321) is convexly arranged on the bottom surface of the pressure release cover plate (32), a plurality of outer connecting holes (322) are formed in the top annular wall (321), and each inner connecting hole (314) is respectively connected with each corresponding outer connecting hole (322) through a fastener (6).

9. The explosion-proof pressure release valve according to claim 5, wherein a plurality of positioning protrusions (315) are further protruding on the outer wall of the pressure release bracket (31), a plurality of positioning grooves (323) are formed on the inner wall of the top annular wall (321), and each positioning protrusion (315) is respectively used for being matched with each corresponding positioning groove (323).

10. A battery pack comprising a housing and a pressure relief valve provided on the housing, characterized in that the pressure relief valve is in particular an explosion proof pressure relief valve according to any one of claims 1-9.